Hydro oil frothing out of tank on 3 point b hoe: Jinma Farmpro Agracat  -- Chinese Tractors Discussion Forum and Review Hydro oil frothing out of tank on 3 point b hoe: Jinma Farmpro Agracat -- Chinese Tractors Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Jinma Farmpro Agracat Forum

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 06-08-2006, 04:22 Post: 130624
locksleyred



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 Hydro oil frothing out of tank on 3 point b hoe

Having problems with hydro oil frothing in the tank on my back hoe. B'hoe working ok but oil escapes ( froth) from the vent holes in the tank cap. Filter was spotless. Oil was as clean as. Made sure all connections from tank to pump were tight so as not to suck air. Other than that I am at a bit of a loss.

Mike, from downunder.






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 06-08-2006, 06:41 Post: 130625
hardwood

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 Hydro oil frothing out of tank on 3 point b hoe

A couple things come to mind. #1 Are you using the fluid recommended for the hoe? The recommended fluid should have an anti foaming agent in it. #2 Could there be water in the fluid? #3 Is something causing the fluid to be hotter than normal? Maybe this will give you some things to check. Best of luck, Frank.






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 06-08-2006, 17:15 Post: 130667
earthwrks

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 Hydro oil frothing out of tank on 3 point b hoe

It could be that you're working too hard to the point the bypass relief valve kicks out which sounds like a hissing or squealing noise. That aerates or foams the oil. Even overstressed anti-foaming oils will foam. My New Holland skid steer uses 10W-30 motor oil for the hydraulic system due to its anti-foaming properties.






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 06-09-2006, 01:02 Post: 130675
locksleyred



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 Hydro oil frothing out of tank on 3 point b hoe

Thanks Frank and Earthwrks, Did all the checking you suggested. Right oil, no water, and never have run it long enough to do anything other than dig a hole. BUT... while doing all the checking I forgot to replace the dipstick when filling oil to correct level. Guess what no oil loss. Replaced the dipstick and oil once again overflowed. Took the filler cap off and worked the hoe noticed the oil level fall and rise in what appears to be, to me, to be a filler tube that goes into the tank far too deep. So when working, oil falls and then rises just that little bit higher in the filler tube each time I move something on the hoe. Eventually the oil overflows. Remove dipstick and its back to normal. Can't leave dipstick out because dirt will enter, I could make a screw in breather to replace the dipstick but that does not tell me why this is happening in the first place. Should filler tubes go 7/8 into the tank? And the cap has a breather anyway!!!! If you have any ideas pleas let me know.
Thanks mate(s) for the suggestions so far.

Mike ( Go Aussie Go, World Cup Soccer)






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 06-09-2006, 08:18 Post: 130687
earthwrks

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 Hydro oil frothing out of tank on 3 point b hoe

lock: The depth of the filler tube doesn't matter so long as it isn't plugged or restricted at the bottom--oil, like water seeks it's own height. Based on what you said I feel it is a venting issue. I'd check that the filler cap vent isn't clogged with dust and wetted with oil. Also---and this is a biggie: depending on the position at-rest of all hydraulics and accessories the level in the tank can vary vastly. This is due to the volume in the cylinders which depends on which side of the piston the oil is at the time of checking the oil level. Some cylinders have large rods like on a loader; these types have much more volume of oil behind the piston versus the rod side which may be very little. That missing oil has to go somewhere---the tank. Conversely, check the oil with the cylinder retracted, lift the loader and oil gets pumped into the cylinder dropping the level. You have to find a happy medium when checking the level--so you may to raise and lower, crowd/uncrowd the dipper stick and open/close the bucket at different postions to get an idea of whre "full" actually is.






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 06-10-2006, 06:55 Post: 130715
locksleyred



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 Hydro oil frothing out of tank on 3 point b hoe

Thanks Earthwrks, Take your point on "where full actually is" did what you suggested and readjusted to get that happy medium. I agree it is a venting problem. It would appear to me that 'they' forgot to put one in. It may be just a case of remove the dipstick and replace with a vent. Filler cap was OK. Actually took it off altogether and the oil still overflowed. As everytime I did an action on the hoe the level in the filler tube crept up just that little bit each time to the point of overflow.
One question though, ' Why does the filler tube go into the tank, why not like a petrol tank where it is welded just to the outside skin of the tank'? There must be some reason behind this practise. In my case having the filler tube not protrude into the tank would have solved the problem as the whole tank would have been vented by the filler cap and the dipstick would be be permanently in place.
These things are sent to try us, but they are fun.
Thanks Mate

Mike






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 06-10-2006, 07:22 Post: 130716
earthwrks

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 Hydro oil frothing out of tank on 3 point b hoe

Depending on who made the tank they have taken parts from some other mfg. and tried tomake them work, or perhaps the tanwas made by someone for a different purpose or application. Generally the filler tube goes down to hold a strainer, but not always; my backhoe is like the "petrol tank" or "gas can", as we would say. The other reason I didn't think of before was---of course--gravity! You're on the bottom of the world so it's gonna pour out!






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 06-12-2006, 03:56 Post: 130752
locksleyred



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 Hydro oil frothing out of tank on 3 point b hoe

HA HA good one Earthwrks. But who said North was top? Depends on your perspective. I'm from Victoria, and apart from Tasmania, we are at the top of Australia. The globe of the world in my house has the South Pole at the top. Makes for reading the names of places difficult though!!!!!
ANyway back to the Backhoe. Personally I think they stuffed up here. Works well without the dipstick in place because it can vent. Will replace D'stick with a vent pipe etc and change when I need to measure oil. Thanks for your time and ideas for without these given freely we wouldn't get anywhere. Love reading all the posts and who knows some day I might be able to help someone.

Thanks Mate

Mike






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 06-12-2006, 07:12 Post: 130754
kthompson



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 Hydro oil frothing out of tank on 3 point b hoe

lock,

A few thoughts if I might, the best I know some parts of Australia get rather hot (even warmer than our 97 yesterday), it could be you don't have the proper oil for the tempature or your cooling system on the hyd oil is not sufficient. Could you have a pressure setting that is too high or running at higher rpm than is needed over heating the oil.

My last thought, contact the mfg of that unit and ask them on the tube in the tank and their suggestion.

Have Good Day and God Bless






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 06-15-2006, 07:44 Post: 130883
locksleyred



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 Hydro oil frothing out of tank on 3 point b hoe

Thanks KT
Wondered about the temperatures in Summer as I cannot see any real oil cooling device. Temp here at the moment is about 50 to 60 degrees as it is Winter( -5 in the mornings though). Run the revs at about 1000 to 1200. Even so the backhoe is jerky in nature and not real smooth, but I'll post that in a new listing.

The back hoe is a Chinese one suited to the JM354 and it is a 3 point linkage attachment. So contacting the manufacturer would be like waiting and watching grass growing!

I just think it is a problem of venting.

Ok thanks mate.

Mike






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Discussion Boards > Active Subjects > Messages as Posted > Jinma Farmpro Agracat Forum

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earthwrks 3 | greg_g 3 | hardwood 1 | kthompson 2 | locksleyred 9 |

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